Interesting Factory Sub Design....Isobaric Maybe??? - Car Audio | DiyMobileAudio.com | Car Stereo Forum

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Old 03-07-2015   #1
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Default Interesting Factory Sub Design....Isobaric Maybe???

This is the factory sub I pulled from my wife's 2011 Honda Pilot. It is very odd looking. It looks like a siamese twin that was never separated at birth. The 2 cones are different sized. The one playing to the front is 7.25" and the one behind is 6". As far as the sound.....not very good. The voice coil is front mounted (i.e. illusion audio) on the rear 6" "sub".

So, is this isobaric or one 6" sub with a 7" passive radiator attached?

Interesting design and I'm just wondering if the benefit to this design may cause us to see more. People that have more knowledge, please discuss.









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Old 03-08-2015   #2
 
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Default Re: Interesting Factory Sub Design....Isobaric Maybe???

Interesting design. I'd like to hear from the pros on this as well.

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Old 03-08-2015   #3
 
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Default Re: Interesting Factory Sub Design....Isobaric Maybe???

Doesn't look isobaric since the area inside the two cones is not isolated. My wild guess would be that it probably a way to bring up cone mass and rigidity using available material and saving spider cost at the same time. As well as gaining some linearity holding the cone at a great width than with the tradition coil first, spider, then surround.
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Old 03-08-2015   #4
 
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Default Re: Interesting Factory Sub Design....Isobaric Maybe???

show all angles and pictures of the spider.

cut out a wedge so we can see a cut-away.

weigh the cones, and give us T-S parameters.
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Old 03-08-2015   #5
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Default Re: Interesting Factory Sub Design....Isobaric Maybe???

There isn't a spider.

T/S are as follows:
Re: 1.802 ohms
Fs: 43.74 Hz
Qts: .824
Qes: .938
Qms: 6.732
Le: .524
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Default Re: Interesting Factory Sub Design....Isobaric Maybe???

might be a way to prevent spider sag, if the surrounds are able to hold the coil in alignment.

for a heavy cone with small Vd, the spider sag issue might be more prevalent and enough of an issue to call for drastic measures.
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Old 03-12-2015   #7
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Default Re: Interesting Factory Sub Design....Isobaric Maybe???

Looks like someone ripped off Earl Geddes.

That's an acoustic lever. He has a patent on that.

An acoustic lever is a speaker design where you have one cone driving a passive cone. In concept, it is somewhat similar to a bandpass box. Except you have a passive radiator instead of a port, and the big difference is that the passive radiator is physically connected to the woofer.



^^ picture this, but with the two cones physically connected


In principle it would be quite simple to waste the surplus labour of the world by building temples and pyramids, by digging holes and filling them up again, or even by producing vast quantities of goods and then setting fire to them. (Orwell)
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Old 03-12-2015   #8
 
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Default Re: Interesting Factory Sub Design....Isobaric Maybe???

Is this any similarity to Alpines PLV-7 without the enclosure? I always thought that was such an interesting design but never could find one. Would like to hear it someday.
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Old 03-12-2015   #9
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Default Re: Interesting Factory Sub Design....Isobaric Maybe???

Just looks like they used a secondary cone/surround as a "spider" vs a traditional one.
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